"She was taken to a local hospital for further testing and is awake, alert and in stable condition," her rep said in a statement at the time. "She will be staying overnight for observation as a precautionary measure."

But Osbourne remained in the hospital for four days as doctors tried to figure out what was wrong with her. “Thank you to all the Doctors Nurses Medical Staff & Employees @CedarsSinai Hospital for fixing me enough to go home,” she tweeted on March 11.